Peter's Model Railroading | My Library | Model Railroading 2000-08/09
Articles Listing

New York Railway Supply PTC Model III Turntable Drive and Indexing System

PTC3 system consists of: controller box, track-selector circuit board, high-precision stepper motor, power supply, shaft connector and necessary connecting cables. The PTC3 motor can index over 14,000 individual locations within a 360° circle, so getting a precise alignment is easy as long as all the rails don't move. The controller can also automatically flip the polarity on the ridge rails (up to 1.5 amp) when the turntable has passed by 90° of rotation. An internal DPDT relay performs that operation, thus making a split-ring or other turntable rail-switching device unnecessary.